<template>
  <view
    id="_root"
    :class="(selectable ? '_select ' : '') + '_root'"
    :style="containerStyle"
  >
    <slot v-if="!nodes[0]"></slot>
    <!-- #ifndef APP-PLUS-NVUE -->
    <node
      v-else
      :childs="nodes"
      :opts="[lazyLoad, loadingImg, errorImg, showImgMenu, selectable]"
      name="span"
    ></node>
    <!-- #endif -->
    <!-- #ifdef APP-PLUS-NVUE -->
    <!-- nvue 3.6.4有bug暂时无法使用webVIew渲染 -->
    <rich-text :nodes="nodes"></rich-text>
    <!-- <web-view ref="web" src="/hybrid/html/local.html" :style="'margin-top:-2px;height:' + height + 'px'" @onPostMessage="_onMessage" ></web-view> -->
    <!-- #endif -->
  </view>
</template>

<script>
/**
 * mp-html v2.4.0
 * @description 富文本组件
 * @tutorial https://github.com/jin-yufeng/mp-html
 * @property {String} container-style 容器的样式
 * @property {String} content 用于渲染的 html 字符串
 * @property {Boolean} copy-link 是否允许外部链接被点击时自动复制
 * @property {String} domain 主域名，用于拼接链接
 * @property {String} error-img 图片出错时的占位图链接
 * @property {Boolean} lazy-load 是否开启图片懒加载
 * @property {string} loading-img 图片加载过程中的占位图链接
 * @property {Boolean} pause-video 是否在播放一个视频时自动暂停其他视频
 * @property {Boolean} preview-img 是否允许图片被点击时自动预览
 * @property {Boolean} scroll-table 是否给每个表格添加一个滚动层使其能单独横向滚动
 * @property {Boolean | String} selectable 是否开启长按复制
 * @property {Boolean} set-title 是否将 title 标签的内容设置到页面标题
 * @property {Boolean} show-img-menu 是否允许图片被长按时显示菜单
 * @property {Object} tag-style 标签的默认样式
 * @property {Boolean | Number} use-anchor 是否使用锚点链接
 * @event {Function} load dom 结构加载完毕时触发
 * @event {Function} ready 所有图片加载完毕时触发
 * @event {Function} imgtap 图片被点击时触发
 * @event {Function} linktap 链接被点击时触发
 * @event {Function} play 音视频播放时触发
 * @event {Function} error 媒体加载出错时触发
 */
// #ifndef APP-PLUS-NVUE
import node from "./node/node";
// #endif
import Parser from "./parser";
const plugins = [];
// #ifdef APP-PLUS-NVUE
const dom = weex.requireModule("dom");
// #endif
export default {
  name: "mp-html",
  data() {
    return {
      nodes: [],
      // #ifdef APP-PLUS-NVUE
      height: 3,
      // #endif
    };
  },
  props: {
    containerStyle: {
      type: String,
      default: "",
    },
    content: {
      type: String,
      default: "",
    },
    copyLink: {
      type: [Boolean, String],
      default: true,
    },
    domain: String,
    errorImg: {
      type: String,
      default: "",
    },
    lazyLoad: {
      type: [Boolean, String],
      default: false,
    },
    loadingImg: {
      type: String,
      default: "",
    },
    pauseVideo: {
      type: [Boolean, String],
      default: true,
    },
    previewImg: {
      type: [Boolean, String],
      default: true,
    },
    scrollTable: [Boolean, String],
    selectable: [Boolean, String],
    setTitle: {
      type: [Boolean, String],
      default: true,
    },
    showImgMenu: {
      type: [Boolean, String],
      default: true,
    },
    tagStyle: Object,
    useAnchor: [Boolean, Number],
  },
  // #ifdef VUE3
  emits: ["load", "ready", "imgtap", "linktap", "play", "error"],
  // #endif
  // #ifndef APP-PLUS-NVUE
  components: {
    node,
  },
  // #endif
  watch: {
    content(content) {
      this.setContent(content);
    },
  },
  created() {
    this.plugins = [];
    for (let i = plugins.length; i--; ) {
      this.plugins.push(new plugins[i](this));
    }
  },
  mounted() {
    if (this.content && !this.nodes.length) {
      this.setContent(this.content);
    }
  },
  beforeDestroy() {
    this._hook("onDetached");
  },
  methods: {
    /**
     * @description 将锚点跳转的范围限定在一个 scroll-view 内
     * @param {Object} page scroll-view 所在页面的示例
     * @param {String} selector scroll-view 的选择器
     * @param {String} scrollTop scroll-view scroll-top 属性绑定的变量名
     */
    in(page, selector, scrollTop) {
      // #ifndef APP-PLUS-NVUE
      if (page && selector && scrollTop) {
        this._in = {
          page,
          selector,
          scrollTop,
        };
      }
      // #endif
    },

    /**
     * @description 锚点跳转
     * @param {String} id 要跳转的锚点 id
     * @param {Number} offset 跳转位置的偏移量
     * @returns {Promise}
     */
    navigateTo(id, offset) {
      return new Promise((resolve, reject) => {
        if (!this.useAnchor) {
          reject(Error("Anchor is disabled"));
          return;
        }
        offset = offset || parseInt(this.useAnchor) || 0;
        // #ifdef APP-PLUS-NVUE
        if (!id) {
          dom.scrollToElement(this.$refs.web, {
            offset,
          });
          resolve();
        } else {
          this._navigateTo = {
            resolve,
            reject,
            offset,
          };
          this.$refs.web.evalJs(
            'uni.postMessage({data:{action:"getOffset",offset:(document.getElementById(' +
              id +
              ")||{}).offsetTop}})"
          );
        }
        // #endif
        // #ifndef APP-PLUS-NVUE
        let deep = " ";
        // #ifdef MP-WEIXIN || MP-QQ || MP-TOUTIAO
        deep = ">>>";
        // #endif
        const selector = uni
          .createSelectorQuery()
          // #ifndef MP-ALIPAY
          .in(this._in ? this._in.page : this)
          // #endif
          .select((this._in ? this._in.selector : "._root") + (id ? `${deep}#${id}` : ""))
          .boundingClientRect();
        if (this._in) {
          selector
            .select(this._in.selector)
            .scrollOffset()
            .select(this._in.selector)
            .boundingClientRect();
        } else {
          // 获取 scroll-view 的位置和滚动距离
          selector.selectViewport().scrollOffset(); // 获取窗口的滚动距离
        }
        selector.exec((res) => {
          if (!res[0]) {
            reject(Error("Label not found"));
            return;
          }
          const scrollTop =
            res[1].scrollTop + res[0].top - (res[2] ? res[2].top : 0) + offset;
          if (this._in) {
            // scroll-view 跳转
            this._in.page[this._in.scrollTop] = scrollTop;
          } else {
            // 页面跳转
            uni.pageScrollTo({
              scrollTop,
              duration: 300,
            });
          }
          resolve();
        });
        // #endif
      });
    },

    /**
     * @description 获取文本内容
     * @return {String}
     */
    getText(nodes) {
      let text = "";
      (function traversal(nodes) {
        for (let i = 0; i < nodes.length; i++) {
          const node = nodes[i];
          if (node.type === "text") {
            text += node.text.replace(/&amp;/g, "&");
          } else if (node.name === "br") {
            text += "\n";
          } else {
            // 块级标签前后加换行
            const isBlock =
              node.name === "p" ||
              node.name === "div" ||
              node.name === "tr" ||
              node.name === "li" ||
              (node.name[0] === "h" && node.name[1] > "0" && node.name[1] < "7");
            if (isBlock && text && text[text.length - 1] !== "\n") {
              text += "\n";
            }
            // 递归获取子节点的文本
            if (node.children) {
              traversal(node.children);
            }
            if (isBlock && text[text.length - 1] !== "\n") {
              text += "\n";
            } else if (node.name === "td" || node.name === "th") {
              text += "\t";
            }
          }
        }
      })(nodes || this.nodes);
      return text;
    },

    /**
     * @description 获取内容大小和位置
     * @return {Promise}
     */
    getRect() {
      return new Promise((resolve, reject) => {
        uni
          .createSelectorQuery()
          // #ifndef MP-ALIPAY
          .in(this)
          // #endif
          .select("#_root")
          .boundingClientRect()
          .exec((res) =>
            res[0] ? resolve(res[0]) : reject(Error("Root label not found"))
          );
      });
    },

    /**
     * @description 暂停播放媒体
     */
    pauseMedia() {
      for (let i = (this._videos || []).length; i--; ) {
        this._videos[i].pause();
      }
      // #ifdef APP-PLUS
      const command =
        'for(var e=document.getElementsByTagName("video"),i=e.length;i--;)e[i].pause()';
      // #ifndef APP-PLUS-NVUE
      let page = this.$parent;
      while (!page.$scope) page = page.$parent;
      page.$scope.$getAppWebview().evalJS(command);
      // #endif
      // #ifdef APP-PLUS-NVUE
      this.$refs.web.evalJs(command);
      // #endif
      // #endif
    },

    /**
     * @description 设置媒体播放速率
     * @param {Number} rate 播放速率
     */
    setPlaybackRate(rate) {
      this.playbackRate = rate;
      for (let i = (this._videos || []).length; i--; ) {
        this._videos[i].playbackRate(rate);
      }
      // #ifdef APP-PLUS
      const command =
        'for(var e=document.getElementsByTagName("video"),i=e.length;i--;)e[i].playbackRate=' +
        rate;
      // #ifndef APP-PLUS-NVUE
      let page = this.$parent;
      while (!page.$scope) page = page.$parent;
      page.$scope.$getAppWebview().evalJS(command);
      // #endif
      // #ifdef APP-PLUS-NVUE
      this.$refs.web.evalJs(command);
      // #endif
      // #endif
    },

    /**
     * @description 设置内容
     * @param {String} content html 内容
     * @param {Boolean} append 是否在尾部追加
     */
    setContent(content, append) {
      if (!append || !this.imgList) {
        this.imgList = [];
      }
      const nodes = new Parser(this).parse(content);
      // #ifdef APP-PLUS-NVUE
      if (this._ready) {
        this._set(nodes, append);
      }
      // #endif
      this.$set(this, "nodes", append ? (this.nodes || []).concat(nodes) : nodes);

      // #ifndef APP-PLUS-NVUE
      this._videos = [];
      this.$nextTick(() => {
        this._hook("onLoad");
        this.$emit("load");
      });

      if (this.lazyLoad || this.imgList._unloadimgs < this.imgList.length / 2) {
        // 设置懒加载，每 350ms 获取高度，不变则认为加载完毕
        let height;
        const callback = (rect) => {
          // 350ms 总高度无变化就触发 ready 事件
          if (rect.height === height) {
            this.$emit("ready", rect);
          } else {
            height = rect.height;
            setTimeout(() => {
              this.getRect().then(callback);
            }, 350);
          }
        };
        this.getRect().then(callback);
      } else {
        // 未设置懒加载，等待所有图片加载完毕
        if (!this.imgList._unloadimgs) {
          this.getRect((rect) => {
            this.$emit("ready", rect);
          });
        }
      }
      // #endif
    },

    /**
     * @description 调用插件钩子函数
     */
    _hook(name) {
      for (let i = plugins.length; i--; ) {
        if (this.plugins[i][name]) {
          this.plugins[i][name]();
        }
      }
    },

    // #ifdef APP-PLUS-NVUE
    /**
     * @description 设置内容
     */
    _set(nodes, append) {
      this.$refs.web.evalJs(
        "setContent(" +
          JSON.stringify(nodes) +
          "," +
          JSON.stringify([
            this.containerStyle.replace(/(?:margin|padding)[^;]+/g, ""),
            this.errorImg,
            this.loadingImg,
            this.pauseVideo,
            this.scrollTable,
            this.selectable,
          ]) +
          "," +
          append +
          ")"
      );
    },

    /**
     * @description 接收到 web-view 消息
     */
    _onMessage(e) {
      const message = e.detail.data[0];
      console.log(e);
      switch (message.action) {
        // web-view 初始化完毕
        case "onJSBridgeReady":
          this._ready = true;
          if (this.nodes) {
            this._set(this.nodes);
          }
          break;
        // 内容 dom 加载完毕
        case "onLoad":
          console.log(111);
          this.height = message.height;
          this._hook("onLoad");
          this.$emit("load");
          break;
        // 所有图片加载完毕
        case "onReady":
          this.getRect()
            .then((res) => {
              this.$emit("ready", res);
            })
            .catch(() => {});
          break;
        // 总高度发生变化
        case "onHeightChange":
          this.height = message.height;
          break;
        // 图片点击
        case "onImgTap":
          this.$emit("imgtap", message.attrs);
          if (this.previewImg) {
            uni.previewImage({
              current: parseInt(message.attrs.i),
              urls: this.imgList,
            });
          }
          break;
        // 链接点击
        case "onLinkTap": {
          const href = message.attrs.href;
          this.$emit("linktap", message.attrs);
          if (href) {
            // 锚点跳转
            if (href[0] === "#") {
              if (this.useAnchor) {
                dom.scrollToElement(this.$refs.web, {
                  offset: message.offset,
                });
              }
            } else if (href.includes("://")) {
              // 打开外链
              if (this.copyLink) {
                plus.runtime.openWeb(href);
              }
            } else {
              uni.navigateTo({
                url: href,
                fail() {
                  uni.switchTab({
                    url: href,
                  });
                },
              });
            }
          }
          break;
        }
        case "onPlay":
          this.$emit("play");
          break;
        // 获取到锚点的偏移量
        case "getOffset":
          if (typeof message.offset === "number") {
            dom.scrollToElement(this.$refs.web, {
              offset: message.offset + this._navigateTo.offset,
            });
            this._navigateTo.resolve();
          } else {
            this._navigateTo.reject(Error("Label not found"));
          }
          break;
        // 点击
        case "onClick":
          this.$emit("tap");
          this.$emit("click");
          break;
        // 出错
        case "onError":
          this.$emit("error", {
            source: message.source,
            attrs: message.attrs,
          });
      }
    },
    // #endif
  },
};
</script>

<style>
/* #ifndef APP-PLUS-NVUE */
/* 根节点样式 */
._root {
  padding: 1px 0;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
}

/* 长按复制 */
._select {
  user-select: text;
}
/* #endif */
</style>
